How to right an explicit formula for the common ratio of 1,-3,9,-

Can (2,3 and square root 10) be sides ona right triangle?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.